Moms are right about almost everything, butscience trumps them on this one. Whenresearchers at Baylor University exposed 44volunteers to the cold virus, they found thatthose who were made to stand in a chilly roomweren't any more likely to get the sniffles thanthose who stayed toasty. A smarter move:Keep your immune system in top shape bygetting enough sleep and exercise. That wayyour body can defend itself from any virus.Body heat escapes through your head, so dry your hair to stay warm.